WO2020192086A1

WO2020192086A1 - Mobile energy storage system and control method therefor

Info

Publication number: WO2020192086A1
Application number: PCT/CN2019/110929
Authority: WO
Inventors: 周晨; 陶以彬; 吴福保; 余豪杰; 杨波; 李官军; 庄俊; 刘欢; 秦昊; 李跃龙
Original assignee: 中国电力科学研究院有限公司
Priority date: 2019-03-22
Filing date: 2019-10-14
Publication date: 2020-10-01
Also published as: CN111725879B; CN111725879A

Abstract

The present application relates to a mobile energy storage system and a control method therefor, the mobile energy storage system comprising a mobile container, a photovoltaic battery arranged on the outside of the mobile container, and an energy storage battery, an energy storage converter, an energy storage converter control circuit, an uninterruptible power supply, a storage battery, a reverse cut-off switch, a DC/DC converter and a monitoring system arranged on the inside of the mobile container.

Description

Mobile energy storage system and control method thereof

This disclosure claims the priority of a Chinese patent application filed with the Chinese Patent Office with an application number of 201910223525.4 on March 22, 2019, and the entire content of the above application is incorporated into this disclosure by reference.

Technical field

This article relates to the field of mobile emergency power supply, specifically to a mobile energy storage system and its control method.

Background technique

The modern society’s dependence on electric energy is increasing, the demand for electricity is increasing rapidly, and the requirements for power supply quality are getting higher and higher, especially for the particularly important load in the first load. Once the power supply is interrupted, it will cause major political influence or Economic loss; specifically, it is usually necessary to temporarily supply power to the branch power load or construction equipment during power construction, power equipment transformation, and field operations.

As the main force of the emergency power supply equipment of the grid, the working environment of the mobile energy storage system has no external mains power. In the prior art, the energy storage battery inside the mobile energy storage system also supplies the internal load while supplying power to the external load. Power supply reduces the power supply time of the energy storage system to the load to a certain extent.

Summary of the invention

This article provides a mobile energy storage system and its control method, which can realize: when the mobile energy storage system is out of operation, the internal load is powered by the photovoltaic cell and the storage battery without consuming the energy of the energy storage battery. The mobile energy storage system During operation, the photovoltaic battery can also charge the energy storage battery, extending the power supply time of the mobile energy storage system.

This article provides a mobile energy storage system. The mobile energy storage system includes: a mobile container, photovoltaic cells arranged outside the mobile container, and energy storage batteries and storage batteries arranged inside the mobile container. Energy converter, energy storage converter control circuit, uninterruptible power supply, battery, inverter switch, DC-DC converter and monitoring system;

The energy storage battery is connected to the energy storage converter, and the energy storage converter is configured to be connected to a load;

The reverse switch is connected to the energy storage battery, the uninterruptible power supply and the DC-DC converter, and the DC-DC converter is connected to the photovoltaic cell;

The uninterruptible power supply includes a DC terminal, an AC input terminal, and an AC output terminal. The DC terminal of the uninterruptible power supply is connected to the inverter switch and the battery, and the AC input terminal of the uninterruptible power supply is connected to the energy storage transformer. The AC output end of the uninterruptible power supply is connected to the control loop and monitoring system of the energy storage converter.

This article provides a control method for a mobile energy storage system, the method includes:

Controlling the reverse switch to switch on the energy storage battery and the DC-DC converter according to the state of the mobile energy storage system, or switch on the uninterruptible power supply and the DC-DC converter;

Among them, if the energy storage battery is in discharging mode or charging mode, the state of the mobile energy storage system is operating, and if the energy storage battery is not in discharging mode and not in charging mode, the state of the mobile energy storage system is out of service status.

Description of the drawings

Figure 1 is a schematic diagram of the structure of this mobile energy storage system;

Figure 2 is a flow chart of the control method of this mobile energy storage system.

detailed description

The specific embodiments of this document will be further described in detail below in conjunction with the accompanying drawings.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments herein, rather than all of them. Based on the embodiments herein, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this text.

This article provides a mobile energy storage system. The mobile energy storage system is a mobile energy storage system powered by optical storage. As shown in Figure 1, the mobile energy storage system includes: a mobile container and The photovoltaic cell outside the mobile container and the energy storage battery, the energy storage converter, the energy storage converter control loop, the uninterruptible power supply, the storage battery, the inverted switch, and the DC-DC arranged inside the mobile container Converter (ie DC/DC converter, where DC is the abbreviation of Direct Current) and monitoring system;

The reverse switch is connected to the energy storage battery, the uninterruptible power supply and the DC/DC converter, and the DC/DC converter is connected to the photovoltaic cell;

It is understandable that the load is the load of the mobile energy storage system, and the load is generated by the mobile energy storage system supplying power to the outside of the mobile energy storage system.

In the embodiment provided herein, the monitoring system is configured to control the reverse switch to turn on the energy storage battery and the DC/DC converter according to the state of the mobile energy storage system, or to turn on the uninterruptible power supply and DC/DC Converter

In some embodiments, in order to realize the above functions, the monitoring system includes:

The first monitoring unit is configured to control the reverse switch to turn on the DC/DC converter and the energy storage battery when the mobile energy storage system is in the running state, and send a fourth control command to the DC/DC converter; this When the energy storage battery supplies power to the external load, and the photovoltaic battery charges the energy storage battery, the service time of the energy storage system is extended.

The second monitoring unit is set to control the reverse switch to turn on the DC/DC converter and the uninterruptible power supply when the mobile energy storage system is in a shutdown state, and compare the output power of the photovoltaic cell with the power of the load As a result, a control command is sent to the DC/DC converter; the load includes an energy storage converter control loop and a monitoring system; at this time, the power supply for the internal load of the energy storage system comes from storage batteries and photovoltaic cells, and does not consume energy storage batteries. Electricity saves the energy of the energy storage battery, and the photovoltaic battery can also charge the battery, prolonging the use time of the internal load.

It is understandable that the load is the load of the mobile energy storage system, the load is different from the aforementioned load, and the load is because the battery and the photovoltaic cell are the load of the mobile energy storage system. Generated by internal power supply, the load may include the energy storage converter control loop and the monitoring system.

The second monitoring unit of the monitoring system includes:

The first monitoring subunit is configured to send a second control command to the DC/DC converter when the output power of the photovoltaic cell is greater than the power of the load and the state of charge of the battery is greater than or equal to 60%;

The second monitoring subunit is configured to send the first control instruction to the DC/DC converter when the output power of the photovoltaic cell is greater than the power of the load and the state of charge of the battery is less than 60%;

The third monitoring subunit is configured to send a fourth control instruction to the DC/DC converter when the output power of the photovoltaic cell is less than the power of the load and the state of charge of the battery is greater than or equal to 10%;

The fourth monitoring subunit is configured to send a third control command to the DC/DC converter when the output power of the photovoltaic cell is less than the power of the load and the state of charge of the battery is less than 10%.

In the embodiment herein, the DC/DC converter includes:

The first adjusting unit is configured to adjust the output power of the photovoltaic cell to the maximum output power when the first control instruction is received, and connect to the storage battery;

The second adjusting unit is configured to adjust the output power of the photovoltaic cell to load power when receiving the second control instruction;

The third adjusting unit is configured to adjust the photovoltaic cell to stop discharging mode when receiving the third control instruction;

The fourth adjusting unit is configured to adjust the output power of the photovoltaic cell to the maximum output power when the fourth control instruction is received.

In addition, the DC/DC converter of the mobile energy storage system in the embodiment of the present invention is a DC/DC converter with a maximum power point tracking (Maximum Power Point Tracking, MPPT) function, which can adjust the output power of the photovoltaic cell to the maximum output The purpose of power; the default state of the reverse switch is to connect the uninterruptible power supply and the DC/DC converter.

This article provides a control method of a mobile energy storage system, the method includes:

According to the state of the mobile energy storage system, controlling the reverse switch to turn on the energy storage battery and the DC/DC converter, or turn on the uninterruptible power supply and the DC/DC converter;

Among them, if the energy storage battery is in discharging mode or charging mode, the state of the mobile energy storage system is the operating state; if the energy storage battery is not in the discharging mode and not in the charging mode, the state of the mobile energy storage system is out of service .

In the embodiment herein, as shown in Figure 2, the reverse switch is controlled according to the state of the mobile energy storage system to turn on the energy storage battery and the DC/DC converter, or turn on the uninterruptible power supply and the DC/DC converter. The DC converter includes:

When the mobile energy storage system is in the running state, the monitoring system controls the reverse switch to turn on the DC/DC converter and the energy storage battery, and sends a fourth control command to the DC/DC converter;

When the state of the mobile energy storage system is out of service, the monitoring system controls the reverse switch to turn on the DC/DC converter and the uninterruptible power supply, and according to the comparison result of the output power of the photovoltaic cell and the power of the load The converter sends control instructions;

Wherein, the load includes an energy storage converter control loop and a monitoring system.

In some embodiments, the sending a control command to the DC/DC converter according to the comparison result of the output power of the photovoltaic cell and the power of the load includes:

When the output power of the photovoltaic cell is greater than the power of the load, and the state of charge of the battery is greater than or equal to 60%, the monitoring system sends a second control command to the DC/DC converter;

When the output power of the photovoltaic cell is greater than the power of the load, and the state of charge of the battery is less than 60%, the monitoring system sends the first control command to the DC/DC converter;

When the output power of the photovoltaic cell is less than the power of the load, and the state of charge of the battery is greater than or equal to 10%, the monitoring system sends a fourth control command to the DC/DC converter;

When the output power of the photovoltaic cell is less than the power of the load, and the state of charge of the battery is less than 10%, the monitoring system sends a third control command to the DC/DC converter.

In some embodiments, when the DC/DC converter receives the first control instruction, adjust the output power of the photovoltaic cell to the maximum output power, and turn on the battery;

When the DC/DC converter receives the second control instruction, adjust the output power of the photovoltaic cell to load power;

When the DC/DC converter receives the third control command, adjust the photovoltaic cell to stop discharging mode;

When the DC/DC converter receives the fourth control instruction, the output power of the photovoltaic cell is adjusted to the maximum output power.

In summary, this article provides a mobile energy storage system and control method thereof, including a mobile container, photovoltaic cells arranged outside the mobile container, and energy storage batteries and storage batteries arranged inside the mobile container. Energy converter, energy storage converter control loop, uninterruptible power supply, battery, reverse switch, DC/DC converter and monitoring system; the mobile energy storage system provided in this article will use the internal photovoltaic cell when it is out of service And the battery supplies power to the internal load without consuming the energy of the energy storage battery; when the mobile energy storage system is running, the photovoltaic battery can also charge the energy storage battery, prolonging the power supply time of the energy storage battery.

Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

This application is described with reference to flowcharts and/or block diagrams of methods, equipment (systems), and computer program products according to the embodiments of this application. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

Claims

A mobile energy storage system comprising: a mobile container, a photovoltaic cell arranged outside the mobile container, an energy storage battery arranged inside the mobile container, and an energy storage converter Power converter, energy storage converter control loop, uninterruptible power supply, battery, inverter switch, DC-DC converter and monitoring system;

The energy storage battery is connected to the energy storage converter, and the energy storage converter is configured to be connected to a load;

The reverse switch is connected to the energy storage battery, the uninterruptible power supply and the DC-DC converter, and the DC-DC converter is connected to the photovoltaic cell;

The uninterruptible power supply includes a DC terminal, an AC input terminal, and an AC output terminal. The DC terminal of the uninterruptible power supply is connected to the inverter switch and the battery, and the AC input terminal of the uninterruptible power supply is connected to the energy storage transformer. The AC output end of the uninterruptible power supply is connected to the control loop and monitoring system of the energy storage converter.
The mobile energy storage system of claim 1, wherein the monitoring system is configured to control an inverted switch to turn on the energy storage battery and the DC-DC converter according to the state of the mobile energy storage system, or turn on Uninterruptible power supply and DC-DC converter;

Among them, if the energy storage battery is in discharging mode or charging mode, the state of the mobile energy storage system is operating, and if the energy storage battery is not in discharging mode and not in charging mode, the state of the mobile energy storage system is out of service status.
The mobile energy storage system of claim 2, wherein the monitoring system comprises:

The first monitoring unit is configured to control the reverse switch to switch on the DC-DC converter and the energy storage battery when the mobile energy storage system is in the running state, and send a fourth control instruction to the DC-DC converter;

The second monitoring unit is set to control the reverse switch to turn on the DC-DC converter and the uninterruptible power supply when the mobile energy storage system is in the shutdown state, and compare the output power of the photovoltaic cell with the power of the load As a result, a control command is sent to the DC-DC converter;

Wherein, the load includes an energy storage converter control loop and a monitoring system.
8. The mobile energy storage system of claim 3, wherein the second monitoring unit comprises:

The first monitoring subunit is configured to send a second control command to the DC-DC converter when the output power of the photovoltaic cell is greater than the power of the load and the state of charge of the battery is greater than or equal to 60%;

The second monitoring subunit is configured to send the first control instruction to the DC-DC converter when the output power of the photovoltaic cell is greater than the power of the load and the state of charge of the battery is less than 60%;

The third monitoring subunit is configured to send a fourth control instruction to the DC-DC converter when the output power of the photovoltaic cell is less than the power of the load and the state of charge of the battery is greater than or equal to 10%;

The fourth monitoring subunit is configured to send a third control instruction to the DC-DC converter when the output power of the photovoltaic cell is less than the power of the load and the state of charge of the battery is less than 10%.
The mobile energy storage system according to claim 4, wherein the DC-DC converter comprises:

The first adjustment unit is configured to adjust the output power of the photovoltaic cell to the maximum output power when the first control instruction is received, and is connected to the storage battery;

The second adjusting unit is configured to adjust the output power of the photovoltaic cell to load power when receiving the second control instruction;

The third adjusting unit is configured to adjust the photovoltaic cell to stop discharging mode when receiving the third control instruction;

The fourth adjusting unit is configured to adjust the output power of the photovoltaic cell to the maximum output power when the fourth control instruction is received.
5. The mobile energy storage system of claim 1, wherein the DC-DC converter is a DC-DC converter with a maximum power point tracking function.
The mobile energy storage system of claim 1, wherein the default state of the reverse switch is to connect the uninterruptible power supply and the DC-DC converter.
A method for controlling a mobile energy storage system according to any one of claims 1-7, the method comprising:

Controlling the reverse switch to switch on the energy storage battery and the DC-DC converter according to the state of the mobile energy storage system, or switch on the uninterruptible power supply and the DC-DC converter;

Among them, if the energy storage battery is in discharging mode or charging mode, the state of the mobile energy storage system is the operating state; if the energy storage battery is not in the discharging mode and not in the charging mode, the state of the mobile energy storage system is out of service .
The method of claim 8, wherein the switching switch is controlled according to the state of the mobile energy storage system to turn on the energy storage battery and the DC-DC converter, or turn on the uninterruptible power supply and the DC-DC converter The device includes:

When the mobile energy storage system is in the running state, the monitoring system controls the reverse switch to turn on the DC-DC converter and the energy storage battery, and sends a fourth control command to the DC-DC converter;

When the state of the mobile energy storage system is out of service, the monitoring system controls the reverse switch to turn on the DC-DC converter and the uninterruptible power supply, and according to the comparison result of the output power of the photovoltaic cell and the power of the load The converter sends control instructions;

Wherein, the load includes an energy storage converter control loop and a monitoring system.
The method according to claim 9, wherein the sending a control command to the DC-DC converter according to the comparison result of the output power of the photovoltaic cell and the power of the load comprises:

When the output power of the photovoltaic cell is greater than the power of the load, and the state of charge of the battery is greater than or equal to 60%, the monitoring system sends a second control command to the DC-DC converter;

When the output power of the photovoltaic cell is greater than the power of the load, and the state of charge of the battery is less than 60%, the monitoring system sends the first control command to the DC-DC converter;

When the output power of the photovoltaic cell is less than the power of the load, and the state of charge of the battery is greater than or equal to 10%, the monitoring system sends a fourth control command to the DC-DC converter;

When the output power of the photovoltaic cell is less than the power of the load, and the state of charge of the battery is less than 10%, the monitoring system sends a third control command to the DC-DC converter.
The method of claim 10, further comprising:

When the DC-DC converter receives the first control instruction, adjust the output power of the photovoltaic cell to the maximum output power, and turn on the battery;

When the DC-DC converter receives the second control instruction, adjusting the output power of the photovoltaic cell to the load power;

When the DC-DC converter receives the third control instruction, adjusting the photovoltaic cell to stop discharging mode;

When the DC-DC converter receives the fourth control instruction, the output power of the photovoltaic cell is adjusted to the maximum output power.